JPS6239113B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a print head scanning drive device in a printing device such as a serial printer, and more particularly to a discharge breakdown type print head scanning drive device in which the print head is pressed against a platen at a predetermined pressure during printing operation. The present invention relates to a scanning drive device for a non-impact print head such as the present invention.

As is well known, during the printing operation of the discharge destruction type print head, a group of pin electrodes is brought into pressure contact with the recording paper (platen) and scanned in a direction perpendicular to the feeding direction of the recording paper, and when the carriage returns, the pin electrode group is pressed against the recording paper (platen). The electrode group is separated from the recording paper and returned to the home position. In such a discharge rupture type printer, the conventional scanning drive device is provided with a scanning device that scans the print head left and right, and a set/reset device that moves the pin electrode group of the print head toward and away from the recording paper. This resulted in a complicated structure, a large number of parts, and high manufacturing costs.

The present invention eliminates the drawbacks of the above-mentioned prior art and further improves the prior invention of Japanese Patent Application No. 30668/1983 filed by the present applicant.

In FIG. 1, an endless timing belt 1 is wound between timing gears (not shown) located at center O ₁ and O ₂ positions.
It is designed to rotate clockwise by a drive motor (not shown) or the like. A drive pin 2 is implanted and fixed to one of the teeth of the timing belt 1 so as to protrude vertically. A carriage 4 is slidably supported by a guide shaft 3 above the timing belt 1, and although it is not clear in the drawing, the carriage 4 is prevented from rotating around the guide shaft 3. ing. A long groove 5 is formed substantially in the center of the carriage 4, perpendicular to the sliding direction thereof, and the drive pin 2 is slidably fitted into the long groove 5. Drive pin 2
moves in an oval loop shape in conjunction with the rotation of the belt 1, and when moving straight between the centers O ₁ and O ₂ , the long groove 5
Push the side of the carriage to the right or left to remove the carriage 4.
When it scans left and right and rotates around the center O ₁ or O ₂ , it moves in the long groove 5 from above to below and vice versa. Front wall 6 of the carriage 4
A guide shaft 8 is installed on the rear protrusion 7 at right angles to the sliding direction of the carriage 4.
A carrier 9 is slidably supported on. The carrier 9 is equipped with a printing head 10 on its right side.
Further, a spring 13 is stretched between the rear part 11 of the carrier 9 and the half-ring-shaped hook part 12 of the front wall 6, and the spring force of the spring 13 urges the carrier 9 upward in FIG. As a result, the pin electrode group 14 of the print head 10 comes into pressure contact with the recording paper 16 that is fed vertically upward in front of the platen 15. Note that the front portion of the print head 10 protrudes from a window hole 17 formed in the front wall portion 6. Furthermore, carrier 9
A protrusion 19 is formed to hang down from the lower surface of the lower part 18 of the carriage 4, and this protrusion 19 is fitted into a guide groove 20 formed in the carriage 4. Guide groove 20
is formed parallel to the guide shaft 8, the protrusion 19 can move in the guide groove 20, and the fitting of the protrusion 19 causes the carrier 9 to move along the guide shaft 8.
It cannot be rotated around. Further, as shown in FIG. 3, a hook-shaped reset lever 21 is rotatably supported on the carriage 4 via a pin 22. The reset lever 21 has two arms 2
1a and 21b, the arm 21a extends to face the front surface of the protrusion 19, and the arm 21b extends obliquely across the long groove 5 in front of the drive pin 2.

In FIG. 1, when the drive pin 2 moves to the right in the illustrated position, the carriage 4 moves to the right as the drive pin 2 pushes the right side of the long groove 5, and at this time the reset lever 21 is in a free state as shown, so the print head 10
The pin electrode group 14 is pressed against the recording paper 16 by the spring force of the spring 13. That is, the print head 10 is scanned to the right with its pin electrode group 14 in pressure contact with the recording paper 16. Then, when the drive pin 2 begins to rotate around the center O ₂ ,
The drive pin 2 moves relatively downward within the long groove 5,
Finally, the arm 21b of the reset lever 21 reaches the position indicated by the chain line in FIG. Press down. Therefore, the carrier 9 or the print head 10
The pin electrode group 14 is separated from the recording paper 16. In this state, the driving pin 2 pushes the left side of the long groove 5, so that the entire carriage 4 is returned to the left, and then the driving pin 2 moves toward the center O ₁
As the drive pin 2 rotates around the long groove 5, the drive pin 2 relatively moves up and down within the long groove 5, and the reset lever 2
1 is released, and the pin electrode group 14 of the print head 10 is again brought into pressure contact with the recording paper 16 by the force of the spring 13 as shown in the first figure.

As described above, according to the print head scanning drive device of the present invention, scanning and resetting of the print head 10 can be performed with a simple configuration, and assembly is simple and manufacturing is possible at low cost. Moreover, since no load is applied to the drive pin 2 supported at one end in a direction perpendicular to its movement direction, the belt 1 is not twisted, and therefore the rotational movement of the belt 1 and the meshing with the timing gear etc. are stable. do.

[Brief explanation of the drawing]

The drawings relate to a printing head scanning drive device according to the present invention, and FIG. 1 is a plan view thereof, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG. 3 is a sectional view taken along the line of FIG. 2. FIG. 1...belt, 2...drive pin, 4...carriage,
5... Long groove, 9... Carrier, 10... Print head, 13...
Spring, 15...platen, 16...recording paper, 21...reset lever.

Claims (1)

[Scope of Claims] 1. A carriage supported slidably in a direction substantially perpendicular to the feeding direction of recording paper; a carriage supported slidably in a direction substantially perpendicular to the sliding direction on the carriage; and a carrier equipped with a printing head; a spring biasing the carrier toward a platen in front of the printing head; a long groove formed in the carriage in a direction substantially perpendicular to the sliding direction thereof; an endless belt, on which a driving pin fitted in the belt is mounted in an upright manner and rotated in a substantially oval loop shape via a driving means; a reset lever that is rotationally displaced by its drive pin when moving from one end of the print head to the other end of the print head, and causes the print head to move away from the platen against the spring; Scan drive.